sealord : Photo Keywords : intertidal species  : The sponge, Pachymatisma johnstonia, grows on a wall of the Gouliot caves on Sark's west coast. I visited the cave system during a low spring tide on the 12 September 2007. The Gouliot Caves were designated a RAMSAR site in April 2007. ©RLLord fishinfo@guernsey.net

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